Pool block



FIG. 1 is a front perspective view of a pool block embodying my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a cross sectional view taken along line 3--3 of FIG. 2;

FIG. 4 is an end elevational view thereof, the other end being a mirror image;

FIG. 5 is a side elevational view thereof, the other side being a mirror image; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a pool block, as shown and described. 